doc & sample: Update documentation for human-in-the-loop and UserProx… #5113

Job	Run time
format	1m 3s
lint	1m 2s
mypy (./packages/autogen-core)	3m 32s
pyright (./packages/autogen-core)	1m 19s
mypy (./packages/agbench)	59s
pyright (./packages/agbench)	58s
mypy (./packages/autogen-ext)	3m 8s
test (./packages/autogen-core)	1m 20s
pyright (./packages/autogen-ext)	1m 12s
mypy (./packages/autogen-agentchat)	1m 27s
pyright (./packages/autogen-agentchat)	1m 7s
test (./packages/autogen-ext)	4m 20s
mypy (./packages/magentic-one-cli)	1m 34s
pyright (./packages/magentic-one-cli)	56s
test (./packages/autogen-agentchat)	1m 15s
docs (./packages/autogen-core)	1m 53s
docs-example-check (./packages/autogen-core)	3m 37s
markdown-code-lint	2m 34s
samples-code-check	1m 6s
test-grpc	1m 29s
check-proto-changes-python	1m 28s
codecov (./packages/autogen-core)	8s
codecov (./packages/autogen-ext)	8s
codecov (./packages/autogen-agentchat)	12s
codecov (autogen-ext-grpc)	10s
	37m 57s

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